CVE-2026-5731
critical · 9.8Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
9.8
CVSS
0.3%
EPSS (exploit prob.)
28th
EPSS percentile
2026-04-07
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-119CWE-787
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| mozilla | firefox | 115.34.0 |
| mozilla | firefox | 140.9.0 |
| mozilla | firefox | 149.0.1 |
| mozilla | thunderbird | 140.9.0 |
| mozilla | thunderbird | 149.0.1 |
Check a specific version with /api/v1/cve/match.
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021894%2C2022225%2C2022252%2C2022294%2C2023007%2C2023130%2C2023191%2C2023364%2C2023829%2C2024074%2C2024417%2C2024433%2C2024436%2C2024437%2C2024453%2C2024461%2C2024462%2C2024472%2C2024474%2C2024477%2C2025364%2C2025401%2C2025402%2C2025472%2C2026287%2C2026299%2C2026305%2C2026426
- https://www.mozilla.org/security/advisories/mfsa2026-25/
- https://www.mozilla.org/security/advisories/mfsa2026-26/
- https://www.mozilla.org/security/advisories/mfsa2026-27/
- https://www.mozilla.org/security/advisories/mfsa2026-28/
- https://www.mozilla.org/security/advisories/mfsa2026-29/
- https://access.redhat.com/errata/RHSA-2026:11805
- https://access.redhat.com/errata/RHSA-2026:11813
- https://access.redhat.com/errata/RHSA-2026:12264
- https://access.redhat.com/errata/RHSA-2026:13342
- https://access.redhat.com/errata/RHSA-2026:13412
- https://access.redhat.com/errata/RHSA-2026:13533
- https://access.redhat.com/errata/RHSA-2026:13582
- https://access.redhat.com/errata/RHSA-2026:13583
- https://access.redhat.com/errata/RHSA-2026:13596
- https://access.redhat.com/errata/RHSA-2026:13600
- https://access.redhat.com/errata/RHSA-2026:13665
- https://access.redhat.com/errata/RHSA-2026:13682
- https://access.redhat.com/errata/RHSA-2026:13683
- https://access.redhat.com/errata/RHSA-2026:13922
- https://access.redhat.com/errata/RHSA-2026:13977
- https://access.redhat.com/errata/RHSA-2026:14223
- https://access.redhat.com/errata/RHSA-2026:14303
- https://access.redhat.com/errata/RHSA-2026:15889
- https://access.redhat.com/errata/RHSA-2026:7671
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-5731